<template class="container">
    <div style="background-color: #ff0000; font-size:20px; width: 100%; height: 30px; line-height: 30px;">
        你好, 我是中国人. this is a test !!!!
    </div>
</template>

<style>
.container {
    width: 100%;
    height: 100%;
}
</style>